test

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RCHT 157 © RCHT Design & Publications 1997 Reviewed 04/2020 V3 Review due 04/2023 What is a visual field test? 3. Press a button as soon as you see a light. Some lights are bright This test examines your central and peripheral (side) vision. You use and some are dim. Don’t be alarmed if there are periods of time this part of your vision when you become aware of objects moving when you do not see any lights, this is normal. Let the technician into view. The visual field test helps to diagnose and monitor certain know if you can not see any lights or if they are not in focus. conditions which affect the (the light sensitive layer at Try to ignore the noises and respond only to the lights. the back of the eye), the (the nerve which carries 4. Blink normally. The best time to blink is after you have just information from your eye to your brain) and the visual pathway pressed the button. through the brain. 5. The test will then be repeated for the other eye.

Why do I need this test? In some cases you may be asked to perform a Goldmann Visual Field In certain eye conditions, the field of vision may be affected. It is Test. This is not a computer controlled test. Instead of flashes of very common to be unaware of early changes to the peripheral light, you will be shown a moving target of different sizes. vision, particularly in conditions such as . Do I need to bring anything with me to the appointment? Will I need the test repeated? Please bring any glasses that you use, particularly reading glasses. This depends on the results. If you have an eye condition which It would be helpful to bring along a copy of your most recent needs to be monitored, you may be asked to have a visual field prescription from the Optician. assessment at regular intervals. A repeat test can improve the reliability of the result and help to monitor any changes to How long will the test take? your vision. Approximately 5-10 minutes for each eye. If a Goldmann Visual Field Test has been requested by your doctor, this can take up to 30 How is the test performed? minutes for each eye. The most common visual field test uses a computer called a Humphrey Visual Field Analyser. The computer projects a series of Remember: lights that flash on and off, one at a time. Most tests try to find the If you are unable to keep your appointment, please tell the hospital dimmest light you can possibly see. so that another person can take your place. 1. You will need to sit comfortably with your forehead and chin If you have any other questions, please ask the staff in the clinic. against the rests. One eye will be covered. 2. Keep looking straight ahead at the central dot throughout the test. Lights will flash on and off at different times and positions within the machine. 1 2